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建立了同时测定烟用香精中蛇床子素和二氢欧山芹醇当归酸酯的超高效液相色谱方法。以体积比为1∶1的乙腈-水溶液为萃取剂,采用ACQUITY UPLCBEH C18(2.1 mm i.d.×50 mm,1.7μm)色谱柱,柱温30℃,乙腈水为流动相进行梯度洗脱;流速为0.3 mL/min,检测波长324 nm,对20种烟用香精样品进行测定。结果表明:蛇床子素和二氢欧山芹醇当归酸酯标准品的色谱峰峰型尖锐且对称,两种物质的分离度大于1.5,在0.20~10.00mg/L范围内呈良好线性关系(r=0.9999);20种烟用香精中均未检测出蛇床子素和二氢欧山芹醇当归酸酯;空白样品中添加高、中、低三个浓度水平的两种物质,检测所得蛇床子素的平均回收率在98.00%~100.44%之间,三日内相对标准偏差在0.74%~2.54%之间;二氢欧山芹醇当归酸酯的平均回收率在99.41%~101.02%之间,三日内相对标准偏差在0.92%~2.27%之间。 相似文献
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采用发酵法制备肉独活化妆品原料液,以蛇床子素含量为菌株的筛选指标,分别对发酵温度、发酵时间、碳源添加量、接种量进行单因素试验,进而用正交试验优化制备工艺,并用脂氧合酶(5-LOX)抑制率评价其抗炎活性。结果表明,鼠李糖乳杆菌为制备肉独活发酵液的适宜菌株,其优化工艺为:发酵温度37℃、发酵时间40 h、碳氮比为6∶1,葡萄糖质量浓度为8 mg/mL、接种量为体积分数0.5%,该条件下制备的肉独活原料液的蛇床子素质量浓度为79.50 mg/L,5-LOX抑制率为84.12%。 相似文献
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建立了铋甲西林片中阿莫西林和甲硝唑的薄层色谱扫描定量分析方法 ,考察了展开剂系统和展开温度对两组分色谱分离的影响情况。采用硅胶 GF2 54 - 0 .50 %羧甲基纤维素钠板 ,以甲醇 -氯仿 -二乙胺 -石油醚 (35∶ 40∶ 1 .0∶ 75)为展开剂 ,两主药斑点经紫外灯定位后 ,不经显色可直接进行双波长薄层色谱扫描测定。以随行外标二点法对样品进行了分析 ,阿莫西林和甲硝唑的回收率分别为 99.82 %和 1 0 0 .9% ,RSD<3.3%。 相似文献
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高效液相色谱法测定蛇床子萃取物中的蛇床子素 总被引:4,自引:0,他引:4
采用高效液相色谱(HPLC)法对传统乙醇提取法(SE)与超临界CO2流体萃取法(SFE-CO2)所得的蛇床子萃取物中所含蛇床子素进行分析测定和比较。首先用柱层析对样品进行预处理,然后用HPLC外标法测定。色谱条件:Diamonsil C18柱,V(甲醇)∶V(水)=80∶20为流动相,检测波长322 nm,柱温35℃。结果表明蛇床子素在6.24μg/mL~37.44μg/mL,峰面积与浓度呈良好的线性关系,相关系数r=0.999 9,方法精密度RSD=1.46%,回收率99.09%~101.86%;SFE-CO2萃取物中蛇床子素的质量分数比SE提高了约11%。 相似文献
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目的通过远志薄层色谱及生物自显影色谱分析,为远志质量评价及对抑制乙酰胆碱酯酶活性成分筛选提供支持。方法采用薄层色谱法分离和自显影活性测定技术,对不同来源远志进行多成分分离及抑制乙酰胆碱酯酶活性分析。结果远志药材可见十二个薄层色谱主斑点,远志汕酮Ⅲ、3,6'-二芥子酰基蔗糖、远志糖苷A可用于远志药材鉴别;细叶远志皂苷、远志皂苷元可用于远志药材质量评价。利用生物自显影色谱斑点初步筛选出1个活性成分。结论远志薄层色谱鉴别方法简便易行,特征性强,可以用于不同远志药材鉴别以及评价药材质量优劣;薄层生物自显影色谱适用于远志乙酰胆碱酯酶抑制成分的筛选。 相似文献
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十二烷基磷酸酯阴离子表面活性剂的薄层色谱分离 总被引:1,自引:0,他引:1
本文用薄层色谱法,采用最优化方法中单纯形优化法选择溶剂系统配比,对混合物十二烷基磷酸酯进行分离。方法简便、快速,斑点集中,分离效果好。 相似文献
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从理论推导得出碳二加氢催化剂选择性快速评价法,并用此方法对三种碳二加氢催化剂选择性进行评价,并指出此快速评价法的独特应用。 相似文献
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目的探讨蛇床子素(osthole)对鼻咽癌裸鼠移植瘤放疗作用的影响及其可能的机制。方法将鼻咽癌CNE2细胞株经NU/NU裸鼠右腋皮下接种,2×10~8个/只,待移植瘤长至150mm~3时,随机分为对照组(隔1 d经腹腔注射无菌生理盐水,0.2 m L/只)、单纯蛇床子素组[隔1 d经腹腔注射,1.5μg/(g·10μL)]、单纯放疗组(5 Gy/次,隔3 d X射线照射1次)、蛇床子素联合放疗组(经腹腔注射蛇床子素2 h后进行放射治疗,剂量与方法同单纯蛇床子素组及单纯放射组)。每3 d测量移植瘤体积,首次给药后第21天取出移植瘤,称瘤重;流式细胞术检测移植瘤细胞凋亡率;荧光定量PCR及Western blot法分别检测移植瘤细胞中血管内皮生长因子(vascular endothelial growth factor,VEGF)及乏氧诱导因子-1α(hypoxia inducible factor-1α,HIF-1α)基因m RNA转录和蛋白表达水平。结果与对照组比较,单纯蛇床子素组、单纯放疗组及蛇床子素联合放射组裸鼠移植瘤体积及瘤重均明显下降(P0.05),细胞凋亡率明显升高(P0.05),其中蛇床子素联合放射组最显著,且该组裸鼠移植瘤中VEGF及HIF-1α基因m RNA转录及蛋白表达水平明显低于单纯蛇床子素组及单纯放疗组(P0.05)。结论蛇床子素可增强鼻咽癌裸鼠移植瘤对放疗的敏感性,其机制可能与下调VEGF及HIF-1α表达,抑制血管生成有关。 相似文献
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当归化学成分与药理作用的研究进展 总被引:1,自引:0,他引:1
当归(Radix Angelica Sinensis)为伞形科植物当归Angelica sinensis(Oliv.)Diels的干燥根,具有补血调血、调经止痛、润肠通便的功效。通过查阅近年来有关资料,对当归的化学成分和药理作用的研究进展进行综述,为进一步研究和开发当归提供依据。 相似文献
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In this paper, the extraction of ferulic acid, a pharmacologically active ingredient from the root of Angelica sinensis with ultrasonic extraction was investigated. Percolation and supercritical fluid extraction (SFE) were also employed to make comparisons with ultrasonic extraction. Three variables, which including the concentration of solvent, the ratio of solvent volume to sample (mL/g), and extraction time, were found to have great influence on ultrasonic extraction. The optimum extraction conditions were using pure ethanol with a ratio of solvent volume to sample 8:1 (mL/g) and extraction time of 30 min. Under the optimum extraction conditions, the extraction yield could reach 6.5% mass fraction, which was higher than that of SFE process with ethanol as co‐solvent and nearly a content of ferulic acid 1.0%; both the yield and the content of ferulic acid were higher than those obtained by percolation. Moreover, the time of ultrasonic extraction was significantly shortened. Overall, Ultrasonic extraction was shown to be highly efficient in the extraction of ferulic acid from Angelica sinensis. 相似文献
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考察当归挥发油的不同提取方法。文中用超临界CO2流体萃取法和微波辅助萃取法研究萃取当归挥发油。实验表明:超临界CO2萃取最佳工艺条件为萃取压力25 MPa、分离釜Ⅰ解析温度55℃、萃取温度45℃,提取率约1.9%;微波辅助萃取最佳工艺条件为无水乙醇为提取溶剂,微波功率800 W、微波辐射时间150 s、液料质量比为4.71∶1,提取率约11.2%。微波辅助萃取法取得当归油的收率高于超临界CO2萃取法。微波辅助萃取法萃取当归挥发油收率高,但外观品质较超临界萃取的当归挥发油差。 相似文献
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Freeze‐dried leaf, stem bark, and root bark powders of Aegiceras corniculatum were extracted with three different types of polar solvents: methanol, ethyl acetate, and water. The methanol extracts had the highest concentrations in total phenolics and extractable condensed tannins, followed by water and ethyl acetate extracts. Analysis by matrix‐assisted laser desorption/ionization time‐of‐flight mass spectrometry (MALDI‐TOF MS) suggested that condensed tannins from leaf, stem bark, and root bark contained prodelphinidins and procyanidins, with the predominance of prodelphinidins and high level of galloylation. Acid‐catalyzed degradation in the presence of benzyl mercaptan indicated that gallocatechin, epigallocatechin, epigallocatechin‐3‐O‐gallate, and epicatechin‐3‐O‐gallate occurred as the terminal units and (epi)gallocatechin, (epi)gallocatechin‐3‐O‐gallate, (epi)catechin, and (epi)catechin‐3‐O‐gallate occurred as the extension units. The mean degrees of polymerization (mDP) of condensed tannins from leaf, stem bark, and root bark were 13.5, 7.4, and 12.3, respectively. The condensed tannins from leaf and stem bark exhibited a higher DPPH radical scavenging activity and ferric reducing/antioxidant power compared to that of synthetic antioxidant butylated hydroxyanisole (BHA). © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 相似文献
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